I agree with big red. That normal bolt cutters are a good start. If the chain is stainless, it is much harder to cut through than galvanized. I made maybe 200 cuts before it was too hard to cut through stainless.
For folks using bolt cutters, does it work for 3/8” chain?
These do:
I think Harbor Freight has a similar one (42 inch) for 33 bucks. Not sure what brand mine is but it has no problem with 3/8 chain. Picked it up at a warehouse sale a bunch of years ago for around 30 bucks.